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authorUlrich Drepper <drepper@redhat.com>2003-03-20 09:03:23 +0000
committerUlrich Drepper <drepper@redhat.com>2003-03-20 09:03:23 +0000
commit3dbe0d9517935d549f2630728500b6f275750ec8 (patch)
treec25d29d53b1ca68d311a36bf9a4b54a200157c06 /sysdeps/i386/i486
parent91958edc8459a45bc8c0b6d355ffbfdd245296fb (diff)
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Change atomic_exchange_and_add to return the old value.
Diffstat (limited to 'sysdeps/i386/i486')
-rw-r--r--sysdeps/i386/i486/bits/atomic.h33
1 files changed, 12 insertions, 21 deletions
diff --git a/sysdeps/i386/i486/bits/atomic.h b/sysdeps/i386/i486/bits/atomic.h
index 80a49872e1..87739c6cc6 100644
--- a/sysdeps/i386/i486/bits/atomic.h
+++ b/sysdeps/i386/i486/bits/atomic.h
@@ -123,33 +123,24 @@ typedef uintmax_t uatomic_max_t;
({ __typeof (*mem) result; \
__typeof (value) addval = (value); \
if (sizeof (*mem) == 1) \
- { \
- __asm __volatile (LOCK "xaddb %b0, %1" \
- : "=r" (result), "=m" (*mem) \
- : "0" (addval), "1" (*mem)); \
- result += addval; \
- } \
+ __asm __volatile (LOCK "xaddb %b0, %1" \
+ : "=r" (result), "=m" (*mem) \
+ : "0" (addval), "1" (*mem)); \
else if (sizeof (*mem) == 2) \
- { \
- __asm __volatile (LOCK "xaddw %w0, %1" \
- : "=r" (result), "=m" (*mem) \
- : "0" (addval), "1" (*mem)); \
- result += addval; \
- } \
+ __asm __volatile (LOCK "xaddw %w0, %1" \
+ : "=r" (result), "=m" (*mem) \
+ : "0" (addval), "1" (*mem)); \
else if (sizeof (*mem) == 4) \
- { \
- __asm __volatile (LOCK "xaddl %0, %1" \
- : "=r" (result), "=m" (*mem) \
- : "0" (addval), "1" (*mem)); \
- result += addval; \
- } \
+ __asm __volatile (LOCK "xaddl %0, %1" \
+ : "=r" (result), "=m" (*mem) \
+ : "0" (addval), "1" (*mem)); \
else \
{ \
- __typeof (*mem) oldval; \
__typeof (mem) memp = (mem); \
do \
- result = (oldval = *memp) + addval; \
- while (__arch_compare_and_exchange_64_acq (memp, result, oldval)); \
+ result = *memp; \
+ while (__arch_compare_and_exchange_64_acq (memp, result + addval, \
+ result)); \
} \
result; })